Definition of "mordacious"
adjective
comparative more mordacious, superlative most mordacious
Prone to biting, aggressive (of an animal etc.).
Quotations
Not gyved with connubial relations, I entered upon my migration entirely isolated, with the exception of a canine quadruped whose mordacious, latrant, lusorious, and venatic qualities, are without parity.
1856, Samuel Klinefelter Hoshour, Letters to Squire Pedant, in the East, page 13